<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			*{padding: 0;margin: 0;}
			.myul{
				height: 400px;
				background-color: #2F4F4F;
			}
			.myul li{
				position: relative;
				height: 30px;
			}
			.myul li>a:hover{
				background-color: #ff6700;
			}
		
			.myul li>a{
				display: block;
				width: 234px;
				height: 100%;
				color: #fff;
				padding-left: 30px;
				line-height: 30px;
				box-sizing: border-box;
			}
			.item{
				display: none;
				width: 200px;
				height: 400px;
				background-color: red;
				position: absolute;
				left: 234px;
				top: 0;
			}
				.myul li>a:hover .item{
				width: 100px;
				display: block;
			}
		</style>
	</head>
	<body>
		<ul class="myul">
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
			<li><a href="">测试1</a><div class="item"></div></li>
		</ul>
	</body>
</html>
